which Mythbusters episodes are HD

[JH1949]

Some Mythbusters epsodes are shown as 16x9 on the Disc SD channel but they look like upconverts on Disc HD channel on my HDTV with faces lacking detail.

Does anybody know what date that they started shooting the episodes below in HD ?

MythBusters TV Show - MythBusters Television Show - TV.com

 

[GweeDo767]

The new ones that get aired have been HD so far. I have only seen 1 or 2 re-runs and they have all been SD upconverted.

 

[abricko]

even the upconverts look a ton better than E* SD zoomed to fill my 16x9. Bring on more Kari Byron in HD!